<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test01</title>
</head>
<body>
<script type="text/javascript">
    // console.log(Number.parseInt("88.88"));
    // console.log(parseInt("88.88"));
    // console.log(window.parseInt("88.88"));

    // console.log(Number.parseInt === parseInt);

    // console.log(Number.isInteger(88));
    // console.log(Number.isInteger(88.88));
    // console.log(Number.isInteger("88"));
    // console.log(Number.isInteger("88.88"));
    // console.log(Number.isInteger(true));
    //
    // console.log(Number.isInteger(3.0));

    // console.log(Number.EPSILON);

    // console.log((0.1 + 0.2) == 0.3);
    // console.log(((0.1 + 0.2) - 0.3) < Number.EPSILON);

    console.log(Number.MAX_SAFE_INTEGER);
    console.log(Number.MIN_SAFE_INTEGER);

    console.log(Number.isSafeInteger(9007199254740991));
    console.log(Number.isSafeInteger(9007199254740992));

</script>
</body>
</html>